Texture flips when sphere is UV-unwrapping
I'm not sure there's any good way to do this unwrap with seams, your stripes will hardly join and they will be distorted. You should try another mode like for example Sphere Projection (or Follow Active Quads). Make sure that your sphere has a very small pole face, and that you're in front view when you'll do the unwrap. Then it should give something like that: